package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CateroyServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;


    /**
     * 根据id删除分类，删除之前判断该分类是否关联了菜品和套餐
     * @param id
     */
    @Override
    public void remove(Long id) {
        //1.查询当前分类是否关联了菜品（查菜品表），如果已经关联，抛出一个业务异常
        //构造查询条件
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);
        //查询
        int count1 = dishService.count(dishLambdaQueryWrapper);
        //已经关联菜品，抛出一个业务异常
        if (count1>0){
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }
        //2.查询当前分类是否关联了套餐（查套餐表 ），如果已经关联，抛出一个业务异常
        //构造查询条件
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        //查询
        int count2 = setmealService.count(setmealLambdaQueryWrapper);
        //已经关联套餐，抛出一个业务异常
        if (count2>0){
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }
        //3.如果二者都没有关联，可以正常删除
        super.removeById(id);
    }
}
